[Puke]

obviously, interfaces for operating all sorts of complex machinery. Large ammounts of effort go into making effective manual interfaces for things like attack helocopters, jet fighters, and main battle tanks. if there were direct mind-machine interfaces, they would become much more effective.

I am sure that new vistas would also open up for computer operating systems and interfaces, and related technologies.

If you would like something less far-out, then artificial limbs are probably the leading example. also, things like chemical dispensors that can be implanted and will regulate the distribution of drugs or enzimes that the body needs.

an example of this, is a recent development in the treatment of diabeties. insulin producing cells have been developed that can be injected into the blood stream, and produce regulated ammounts of insulin, feeding off the nutrients in the blood of the subject. problem is, white blood cells tend to kill them off. so they are encased in a microscopic 'cage' (think wiffle-ball) which has openings large enough for nutrients to be absorbed and insulin to pass, but small enough to block white blood cells.